如何用JS实现对象转为url参数

//导出全部查询结果
function exportExcel(btnFlag) {
  //查询条件验证
  searchCheck(btnFlag);
  var str = parseParam(conditions);
  var url = "/wamei/articleStatisticsController/export/excel.htm?"+str;
  window.location.href=url;
}
//将对象转成url 参数
var parseParam=function(param, key){
  var paramStr="";
  if(param instanceof String||param instanceof Number||param instanceof Boolean){
    paramStr+="&"+key+"="+encodeURIComponent(param);
  }else{
    $.each(param,function(i){
      var k=key==null?i:key+(param instanceof Array?"["+i+"]":"."+i);
      paramStr+='&'+parseParam(this, k);
    });
  }
  return paramStr.substr(1);
};